Chip capacitors distinguish between positive and negative electrode methods, chip capacitors full name: multilayer (laminated, laminated) chip ceramic capacitors, also known as chip capacitors, chip capacitance. The appearance is usually yellow, black, and silver. It can be divided into two categories: non-polar and polar. The chip has polar capacitors, tantalum capacitors are more, and one end of the color ring is positive. This paper mainly discusses the method of distinguishing the positive and negative electrodes of polar chip capacitor.

Aluminum electrolytic capacitor The positive and negative electrodes of the capacitor are distinguished and measured. The black block marked on the capacitor is the negative electrode. There are two semi-circles on the capacitor position on the PCB, and the corresponding pin of the colored semi-circle is the negative pole. The length of the pin is also used to distinguish the positive and negative poles.

When we do not know the positive and negative electrodes of the capacitor, we can use a multimeter to measure it. The medium between the two poles of the capacitor is not an absolute insulator, and its resistance is not infinite, but a finite value, generally above 1000 megohm. The resistance between the two poles of the capacitor is called the insulation resistance or the leakage resistance. Only when the positive electrode of the electrolytic capacitor is connected to the positive power supply (the black watch pen when the electric block), and the negative end is connected to the negative power supply (the red watch pen when the electric block), the leakage current of the electrolytic capacitor is small (the leakage resistance is large). On the contrary, the leakage current of the electrolytic capacitor increases (the leakage resistance decreases).

In this way, we first assume a very "+" pole, the pointer multimeter uses R*100 or R*1K stop, and then the assumed "+" pole is connected to the black pen of the multimeter, and the other electrode is connected to the red pen of the multimeter, and the scale where the watch hand stops (the left resistance of the watch hand is large), (for the digital multimeter, the reading can be directly read.) Then the capacitor is discharged (the two leads touch), and then the two markers are switched and the measurement is performed again. In the two measurements, when the final position of the watch hand is to the left (or the resistance value is large), the black watch pen is connected to the positive electrode of the electrolytic capacitor.

One is a common tantalum capacitor, which is cuboid shape, and the end marked with "-" is positive.

There is also a silver surface capacitor, presumably should be aluminum electrolysis. It is round above and square below, which is very common on the optical drive circuit board. The capacitor is negative at the end marked with a "-".

The polar capacitor is what we usually call the electrolytic capacitor, generally we usually use the most for the aluminum electrolytic capacitor, because its electrolyte is aluminum, so its temperature stability and accuracy are not very high, and the chip element because of its close to the circuit plate, so the temperature stability is required to be high, so the chip capacitor is more than the tantalum capacitor, according to its different voltage resistance, Chip capacitors can be divided into A, B, C, D four series, the specific classification is as follows:

Type Package type Withstand voltage

9f8a9168f444f0c5a3520f44e537a09423932.png

A 3216 10V

B 3528 16V

C 6032 25V

D 7343 35V

The chip tantalum capacitor package is divided into type A (3216), Type B (3528), type C (6032), type D (7343), type E (7845). The oblique Angle is the positive pole,(master can discuss whether the small triangle represents the positive pole? This is how the yellow tantalum capacitor is marked in the charging treasure map I sent! I already have a reply in my post, which is actually the logo of AVX.)

You can judge from the feet, the long is positive, the short is negative. On the capacitor, one half of the color paint is the negative electrode.

The term solid state electrolysis or liquid capacitance refers to the material used for its cathode. The advantage of using an electrolyte as a cathode is that the capacitance can be very large. However, the electrolyte is easy to volatilize and leak in high temperature environment, which has great influence on life and stability. Solid-state capacitors use functional conductive polymers as dielectric materials, which will not cause blasting when energized for a long time without use. And at low temperatures will not be due to the slow movement of electrolyte ions and not reach the due characteristics and functions, compared with liquid electrolytes, solid capacitors have environmental protection, low impedance, high and low temperature stability, high grain resistance and high reliability and other superior characteristics.

The method of the chip capacitor to distinguish between positive and negative electrodes is not easy to identify, but the chip tantalum capacitor can be clearly identified by the naked eye, and the above is marked, and you can simply see the positive and negative electrodes. The content of this sharing is here, and I hope to help you.